FIT: add ability to check hashes of all images in FIT, improve output

- add function fit_all_image_check_hashes() that verifies if all
  hashes of all images in the FIT are valid
- improve output of fit_image_check_hashes() when the hash check fails

Signed-off-by: Bartlomiej Sieka <tur@semihalf.com>
2 files changed